/* todo.academy 2.0 · components.css
   Framework-neutral component styles. Requires tokens/tokens.css loaded first.
   Class prefix: .ta- · States: .is-* and ARIA attribute selectors.
   Fonts: IBM Plex Sans / Mono (OFL, Google Fonts) with system fallbacks. */

/* ---------- base ---------- */
.ta-scope, .ta-scope *, .ta-scope *::before, .ta-scope *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body.ta-scope {
  margin: 0; background: var(--ta-paper); color: var(--ta-ink);
  font: 400 var(--ta-type-ui-size)/var(--ta-type-ui-lh) var(--ta-font-sans);
}
.ta-scope img, .ta-scope svg { display: block; }
.ta-scope [hidden] { display: none !important; }
.ta-scope a { color: var(--ta-link); text-decoration: underline; text-underline-offset: 3px; }
.ta-scope a:hover { color: var(--ta-link-hover); }
.ta-scope :focus-visible { outline: var(--ta-focus-width) solid var(--ta-focus-ring); outline-offset: var(--ta-focus-offset); }
.on-bench :focus-visible, .ta-term :focus-visible, .ta-editor :focus-visible { outline-color: var(--ta-focus-ring-bench); }
.ta-container { max-width: var(--ta-page-max); margin: 0 auto; padding: 0 var(--ta-s-6); }
.ta-visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.ta-skip { position: absolute; left: var(--ta-s-4); top: -48px; z-index: 100; background: var(--ta-action); color: var(--ta-action-text); padding: var(--ta-s-3) var(--ta-s-4); border-radius: var(--ta-r-2); transition: top var(--ta-t-reveal) var(--ta-ease-out); }
.ta-skip:focus { top: var(--ta-s-4); color: var(--ta-action-text); }
.ta-meta { font: 500 var(--ta-type-meta-size)/1.35 var(--ta-font-mono); letter-spacing: 0.04em; color: var(--ta-ink-3); text-transform: uppercase; }

/* ---------- buttons ---------- */
.ta-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--ta-s-2);
  font: 500 var(--ta-type-ui-size)/1 var(--ta-font-sans); white-space: nowrap;
  min-height: 44px; padding: 0 var(--ta-s-5); border-radius: var(--ta-r-2);
  background: var(--ta-btn-primary-bg); color: var(--ta-btn-primary-text); border: 1px solid transparent;
  cursor: pointer; text-decoration: none;
}
.ta-btn:hover { background: var(--ta-btn-primary-bg-hover); color: var(--ta-btn-primary-text); }
.ta-btn--secondary { background: transparent; color: var(--ta-ink); border-color: var(--ta-btn-secondary-border); }
.ta-btn--secondary:hover { background: transparent; color: var(--ta-ink); border-color: var(--ta-ink); }
.ta-btn--destructive { background: transparent; color: var(--ta-btn-destructive); border-color: var(--ta-fail-border); }
.ta-btn--destructive:hover { background: transparent; color: var(--ta-btn-destructive); border-color: var(--ta-btn-destructive); }
.ta-btn--bench { background: var(--ta-action-on-bench); color: var(--ta-ink); }
.ta-btn--bench:hover { background: #FFFFFF; color: var(--ta-ink); }
.ta-btn--ghost-bench { background: transparent; color: var(--ta-bench-text); border-color: var(--ta-bench-border); }
.ta-btn--ghost-bench:hover { color: var(--ta-bench-text); border-color: var(--ta-bench-text-3); background: transparent; }
.ta-btn--sm { min-height: 36px; padding: 0 var(--ta-s-4); font-size: var(--ta-type-ui-small-size); }
.ta-btn[disabled] { background: var(--ta-paper-recessed); color: var(--ta-locked-text); cursor: not-allowed; }
.ta-btn[aria-busy="true"] { opacity: 0.85; pointer-events: none; }
.ta-btn .ta-icon { width: 16px; height: 16px; }

/* ---------- forms ---------- */
.ta-field { display: flex; flex-direction: column; gap: var(--ta-s-2); }
.ta-label { font: 500 var(--ta-type-ui-small-size)/1.4 var(--ta-font-sans); color: var(--ta-ink); }
.ta-input {
  font: 400 var(--ta-type-ui-size)/1.4 var(--ta-font-sans); color: var(--ta-ink);
  background: var(--ta-paper-raised); border: 1px solid var(--ta-input-border); border-radius: var(--ta-r-2);
  min-height: 44px; padding: 0 var(--ta-s-4); width: 100%;
}
.ta-input::placeholder { color: var(--ta-ink-3); }
.ta-input[aria-invalid="true"] { border-color: var(--ta-fail); border-width: 1.5px; }
.ta-input[disabled] { background: var(--ta-paper-recessed); color: var(--ta-locked-text); border-color: var(--ta-paper-border); }
.ta-error-msg { display: flex; gap: var(--ta-s-1); align-items: center; font: 400 13px/1.4 var(--ta-font-sans); color: var(--ta-fail); }
.ta-search { position: relative; }
.ta-search .ta-icon { position: absolute; left: 14px; top: 50%; translate: 0 -50%; width: 17px; height: 17px; color: var(--ta-ink-3); pointer-events: none; }
.ta-search .ta-input { padding-left: 40px; }
select.ta-input { appearance: none; font-weight: 500; padding-right: 40px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%234E5850' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 14px center; background-size: 16px; }

/* ---------- filter chips (single-select, shareable state) ---------- */
.ta-chip {
  font: 500 var(--ta-type-ui-small-size)/1 var(--ta-font-sans); white-space: nowrap;
  min-height: 44px; padding: 0 var(--ta-s-4); border-radius: var(--ta-r-2);
  background: transparent; color: var(--ta-ink); border: 1px solid var(--ta-btn-secondary-border); cursor: pointer;
}
.ta-chip:hover { border-color: var(--ta-ink); }
.ta-chip[aria-pressed="true"] { background: var(--ta-action); color: var(--ta-action-text); border-color: var(--ta-action); }
@media (min-width: 768px) { .ta-chip { min-height: 38px; } }

/* ---------- public navigation ---------- */
.ta-nav { border-bottom: 1px solid var(--ta-paper-border); background: var(--ta-paper); }
.ta-nav__row { display: flex; align-items: center; justify-content: space-between; min-height: 68px; gap: var(--ta-s-4); }
.ta-brand { display: inline-flex; align-items: center; gap: 9px; font: 600 17px/1 var(--ta-font-sans); color: var(--ta-ink); text-decoration: none; }
.ta-brand em { font-style: normal; color: var(--ta-link); }
.ta-brand img, .ta-brand svg { width: 26px; height: 26px; }
.ta-nav__links { display: none; align-items: center; gap: var(--ta-s-8); }
.ta-nav__links a { font: 500 var(--ta-type-ui-size)/1 var(--ta-font-sans); color: var(--ta-ink); text-decoration: none; }
.ta-nav__links a:hover { color: var(--ta-link-hover); }
.ta-nav__links a[aria-current="page"] { border-bottom: 2px solid var(--ta-ink); padding-bottom: 4px; }
.ta-menu-btn { display: inline-flex; align-items: center; justify-content: center; width: 44px; height: 44px; background: transparent; border: none; color: var(--ta-ink); cursor: pointer; }
@media (min-width: 900px) { .ta-nav__links { display: flex; } .ta-menu-btn { display: none; } }
.ta-mobile-menu { position: fixed; inset: 0; z-index: 60; background: var(--ta-paper); display: flex; flex-direction: column; }
.ta-mobile-menu[hidden] { display: none; }
.ta-mobile-menu__head { display: flex; align-items: center; justify-content: space-between; min-height: 60px; padding: 0 var(--ta-s-2) 0 var(--ta-s-4); border-bottom: 1px solid var(--ta-paper-border); }
.ta-mobile-menu nav { padding: var(--ta-s-2); display: flex; flex-direction: column; }
.ta-mobile-menu nav a { font: 500 16px/1 var(--ta-font-sans); color: var(--ta-ink); text-decoration: none; padding: 15px var(--ta-s-3); border-radius: var(--ta-r-2); }
.ta-mobile-menu nav a:hover { background: var(--ta-paper-recessed); }

/* ---------- course card ---------- */
.ta-card {
  background: var(--ta-card-bg); border: 1px solid var(--ta-card-border); border-radius: var(--ta-r-3);
  padding: 22px; display: flex; flex-direction: column; gap: var(--ta-s-3); min-height: 228px;
  transition: border-color var(--ta-t-reveal) var(--ta-ease-out), box-shadow var(--ta-t-reveal) var(--ta-ease-out);
}
.ta-card:hover { border-color: var(--ta-paper-border-strong); box-shadow: var(--ta-shadow-1); }
.ta-card__head { display: flex; align-items: flex-start; justify-content: space-between; gap: var(--ta-s-3); }
.ta-card__title { font: 600 var(--ta-type-title-3-size)/var(--ta-type-title-3-lh) var(--ta-font-sans); margin: 0; min-width: 0; overflow-wrap: break-word; }
.ta-card__summary { font: 400 var(--ta-type-ui-small-size)/1.55 var(--ta-font-sans); color: var(--ta-ink-2); margin: 0; flex: 1;
  display: block; overflow: visible; }
.ta-card__meta { font: 400 13px/1.4 var(--ta-font-sans); color: var(--ta-ink-3); }
.ta-card__foot { display: flex; align-items: center; justify-content: space-between; border-top: 1px solid var(--ta-paper-recessed); padding-top: var(--ta-s-4); }
.ta-status { flex: none; font: 500 12.5px/1 var(--ta-font-sans); color: var(--ta-ink-2); background: var(--ta-paper-recessed); border-radius: 4px; padding: 6px 9px; white-space: nowrap; }
.ta-status--soon { background: transparent; border: 1px solid var(--ta-paper-border); color: var(--ta-ink-3); }

/* ---------- accordion (phases and chapters) ---------- */
.ta-acc { border: 1px solid var(--ta-paper-border); border-radius: var(--ta-r-3); overflow: hidden; background: var(--ta-paper-raised); }
.ta-acc__head {
  display: flex; align-items: center; gap: var(--ta-s-4); width: 100%; text-align: left;
  background: var(--ta-paper-raised); border: none; border-bottom: 1px solid var(--ta-paper-recessed);
  padding: var(--ta-s-4) 18px; cursor: pointer; min-height: 44px;
}
.ta-acc__head:hover { background: var(--ta-paper); }
.ta-acc__num { font: 500 12.5px/1 var(--ta-font-mono); color: var(--ta-ink-3); flex: none; }
.ta-acc__title { flex: 1; min-width: 0; font: 600 15.5px/1.3 var(--ta-font-sans); color: var(--ta-ink); }
.ta-acc__sub { display: block; font: 400 13px/1.4 var(--ta-font-sans); color: var(--ta-ink-3); font-weight: 400; margin-top: 2px; }
.ta-acc__chev { flex: none; transition: rotate var(--ta-t-reveal) var(--ta-ease-out); color: var(--ta-ink-2); }
.ta-acc__head[aria-expanded="true"] .ta-acc__chev { rotate: 180deg; }
.ta-acc__panel { background: var(--ta-paper); border-bottom: 1px solid var(--ta-paper-recessed); }
.ta-acc__panel[hidden] { display: none; }
.ta-row { display: flex; align-items: center; gap: var(--ta-s-3); padding: 12px 18px 12px 46px; border-bottom: 1px solid var(--ta-paper-recessed); min-height: 44px; }
.ta-row:last-child { border-bottom: none; }
.ta-row__label { flex: 1; min-width: 0; font: 400 var(--ta-type-ui-small-size)/1.4 var(--ta-font-sans); }
.ta-state { flex: none; font: 500 12.5px/1 var(--ta-font-sans); color: var(--ta-ink-2); display: inline-flex; align-items: center; gap: 5px; white-space: nowrap; }
.ta-state--ok { color: var(--ta-ok); }
.ta-state--locked { color: var(--ta-locked-text); }
.ta-row.is-locked .ta-row__label { color: var(--ta-locked-text); }
.ta-row.is-current { background: var(--ta-paper-recessed); box-shadow: inset 3px 0 0 var(--ta-action); }
.ta-row.is-current .ta-row__label { font-weight: 500; }

/* ---------- location + progress ---------- */
.ta-loc { font: 500 var(--ta-type-meta-size)/1.35 var(--ta-font-mono); letter-spacing: 0.04em; color: var(--ta-ink-3); text-transform: uppercase; }
.ta-progress { display: block; }
.ta-progress__bar { height: 5px; background: var(--ta-paper-recessed); border-radius: 3px; overflow: hidden; }
.ta-progress__fill { height: 100%; background: var(--ta-progress-fill); border-radius: 3px; }
.ta-progress__text { font: 400 12.5px/1.4 var(--ta-font-sans); color: var(--ta-ink-3); margin-top: 7px; }

/* ---------- reader typography ---------- */
.ta-prose { max-width: var(--ta-reading-max); font: 400 var(--ta-type-reading-size)/var(--ta-type-reading-lh) var(--ta-font-sans); text-wrap: pretty; }
.ta-prose h1 { font: 600 clamp(24px, 4.5vw, var(--ta-type-title-1-size))/var(--ta-type-title-1-lh) var(--ta-font-sans); letter-spacing: -0.015em; margin: 0 0 var(--ta-s-4); }
.ta-prose h2 { font: 600 var(--ta-type-title-2-size)/var(--ta-type-title-2-lh) var(--ta-font-sans); letter-spacing: -0.01em; margin: var(--ta-s-6) 0 var(--ta-s-3); }
.ta-prose h3 { font: 600 var(--ta-type-title-3-size)/var(--ta-type-title-3-lh) var(--ta-font-sans); margin: var(--ta-s-5) 0 var(--ta-s-2); }
.ta-prose p, .ta-prose ul, .ta-prose ol { margin: 0 0 var(--ta-s-4); }
.ta-prose li { margin-bottom: 6px; }
.ta-prose code { font: 400 15px/1 var(--ta-font-mono); background: var(--ta-paper-recessed); border-radius: var(--ta-r-1); padding: 2px 6px; overflow-wrap: break-word; }
.ta-prose table { border-collapse: collapse; width: 100%; font-size: 15px; }
.ta-prose th { text-align: left; font: 500 var(--ta-type-meta-size)/1.35 var(--ta-font-mono); letter-spacing: 0.04em; color: var(--ta-ink-3); text-transform: uppercase; border-bottom: 1px solid var(--ta-paper-border-strong); padding: var(--ta-s-2) var(--ta-s-3) var(--ta-s-2) 0; }
.ta-prose td { padding: 9px var(--ta-s-3) 9px 0; border-bottom: 1px solid var(--ta-paper-recessed); }
.ta-note { display: flex; gap: var(--ta-s-3); border: 1px solid var(--ta-info-border); background: var(--ta-info-tint); color: var(--ta-info-deep); border-radius: var(--ta-r-2); padding: var(--ta-s-4) var(--ta-s-4); margin: 0 0 var(--ta-s-4); font-size: 15px; line-height: 1.6; }
.ta-note--caution { border-color: var(--ta-warn-border); background: var(--ta-warn-tint); color: var(--ta-warn-deep); }
.ta-note .ta-icon { flex: none; width: 17px; height: 17px; margin-top: 3px; }
.ta-example { border: 1px solid var(--ta-paper-border); border-radius: var(--ta-r-2); padding: var(--ta-s-4); margin: 0 0 var(--ta-s-4); }
.ta-codeblock { background: var(--ta-terminal-bg); border: 1px solid var(--ta-bench-border); border-radius: var(--ta-r-3); padding: var(--ta-s-4) 18px; margin: 0 0 var(--ta-s-4); overflow-x: auto; }
.ta-codeblock code { font: 400 var(--ta-type-code-size)/1.7 var(--ta-font-mono); color: var(--ta-bench-text); background: none; padding: 0; white-space: pre; }

/* ---------- activity + hints + proof ---------- */
.ta-activity { border: 1px solid var(--ta-paper-border-strong); border-radius: var(--ta-r-3); padding: var(--ta-s-4) 18px; background: var(--ta-paper-raised); margin: 0 0 var(--ta-s-3); }
.ta-activity__head { display: flex; align-items: center; justify-content: space-between; gap: var(--ta-s-3); margin-bottom: var(--ta-s-2); }
.ta-activity.is-complete { border-color: var(--ta-ok-border); background: var(--ta-ok-tint); }
.ta-activity.is-complete .ta-activity__body { color: var(--ta-ok-deep); }
.ta-activity__body { font: 400 15px/1.6 var(--ta-font-sans); }
.ta-hints { border: 1px solid var(--ta-paper-border); border-radius: var(--ta-r-3); padding: var(--ta-s-4) 18px; margin: 0 0 var(--ta-s-6); }
.ta-hint { border-left: 2px solid var(--ta-paper-border-strong); padding: 2px 0 2px 14px; margin-bottom: var(--ta-s-3); }
.ta-hint[hidden] { display: none; }
.ta-hint__level { font: 500 11.5px/1 var(--ta-font-mono); letter-spacing: 0.05em; color: var(--ta-ink-3); margin-bottom: 4px; }
.ta-proof { border-radius: var(--ta-r-3); padding: 18px; border: 1px solid var(--ta-paper-border); }
.ta-proof[hidden] { display: none; }
.ta-proof__head { display: flex; align-items: center; gap: 9px; font: 600 16px/1 var(--ta-font-sans); margin-bottom: var(--ta-s-2); }
.ta-proof--ok { border-color: var(--ta-ok-border); background: var(--ta-ok-tint); color: var(--ta-ok-deep); }
.ta-proof--fail { border-color: var(--ta-fail-border); background: var(--ta-fail-tint); color: var(--ta-fail-deep); }
.ta-proof__evidence { font: 400 13.5px/1.8 var(--ta-font-mono); color: #2C5B41; background: rgba(255,255,255,.55); border-radius: var(--ta-r-2); padding: var(--ta-s-3) 14px; margin: var(--ta-s-3) 0; }

/* ---------- terminal ---------- */
.ta-term { background: var(--ta-terminal-bg); border: 1px solid var(--ta-bench-border); border-radius: var(--ta-r-4); overflow: hidden; display: flex; flex-direction: column; min-height: 0; }
.ta-term__head { display: flex; align-items: center; justify-content: space-between; gap: var(--ta-s-3); padding: 10px var(--ta-s-4); border-bottom: 1px solid var(--ta-bench-border); }
.ta-term__title { font: 500 11.5px/1 var(--ta-font-mono); letter-spacing: 0.05em; color: var(--ta-bench-text-2); text-transform: uppercase; }
.ta-term__note { font: 400 12px/1 var(--ta-font-sans); color: var(--ta-bench-text-3); }
.ta-term__scroll { flex: 1; min-height: 0; overflow: auto; padding: 14px var(--ta-s-4); font: 400 var(--ta-type-terminal-size)/var(--ta-type-terminal-lh) var(--ta-font-mono); }
.ta-term__line { color: var(--ta-terminal-output); white-space: pre; width: max-content; min-width: 100%; padding-right: 10px; }
.ta-term__line--cmd { color: var(--ta-bench-text); }
.ta-term__line--cmd .ta-term__prompt { color: var(--ta-terminal-prompt); }
.ta-term__line--err { color: var(--ta-terminal-error); }
.ta-term__line--sys { color: var(--ta-bench-text-3); white-space: pre-wrap; width: auto; min-width: 0; }
.ta-term__inputrow { display: flex; align-items: center; gap: 10px; border-top: 1px solid var(--ta-bench-border); padding: var(--ta-s-2) var(--ta-s-4); min-height: 44px; }
.ta-term__inputrow .ta-term__prompt { font: 500 var(--ta-type-terminal-size)/1 var(--ta-font-mono); color: var(--ta-terminal-prompt); flex: none; }
.ta-term__input { flex: 1; min-width: 0; font: 400 var(--ta-type-terminal-size)/1.4 var(--ta-font-mono); color: var(--ta-bench-text); background: transparent; border: none; outline: none; height: 28px; }
.ta-term__input::placeholder { color: var(--ta-bench-text-3); }
.ta-kbd { font: 500 10.5px/1 var(--ta-font-mono); color: var(--ta-bench-text-3); border: 1px solid var(--ta-bench-border); border-radius: 4px; padding: 4px 6px; white-space: nowrap; }

/* ---------- editor + explorer ---------- */
.ta-editor { display: flex; background: var(--ta-bench-2); border: 1px solid var(--ta-bench-border); border-radius: var(--ta-r-4); overflow: hidden; min-height: 0; }
.ta-tree { width: 190px; flex: none; border-right: 1px solid var(--ta-bench-border); padding: 10px 0; overflow-y: auto; color: var(--ta-bench-text-2); }
.ta-tree__head { display: flex; justify-content: space-between; font: 500 11px/1 var(--ta-font-mono); letter-spacing: 0.06em; color: var(--ta-bench-text-3); padding: 2px 14px 10px; }
.ta-tree__folder { display: flex; align-items: center; gap: 6px; width: 100%; min-height: 32px; padding: 0 12px 0 10px; background: transparent; border: none; cursor: pointer; text-align: left; font: 500 13px/1 var(--ta-font-mono); color: var(--ta-bench-text-2); }
.ta-tree__folder:hover { background: var(--ta-bench-3); }
.ta-tree__folder .ta-acc__chev { color: var(--ta-bench-text-3); width: 14px; height: 14px; }
.ta-tree__folder[aria-expanded="true"] .ta-acc__chev { rotate: 90deg; }
.ta-tree__children { position: relative; }
.ta-tree__children[hidden] { display: none; }
.ta-tree__children::before { content: ""; position: absolute; left: 16px; top: 0; bottom: 0; width: 1px; background: var(--ta-bench-guide); }
.ta-tree__file { display: flex; align-items: center; gap: 6px; min-height: 32px; padding: 0 12px 0 30px; font: 400 13px/1 var(--ta-font-mono); color: var(--ta-bench-text-2); cursor: pointer; }
.ta-tree__file:hover { background: var(--ta-bench-3); }
.ta-tree__file[aria-current="true"] { background: var(--ta-bench-3); box-shadow: inset 2px 0 0 var(--ta-brand-seed); color: var(--ta-bench-text); }
.ta-tree__count { margin-left: auto; font: 500 11px/1 var(--ta-font-mono); color: var(--ta-bench-text-3); }
.ta-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--ta-warn-bench); margin-left: auto; flex: none; }
.ta-editor__main { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.ta-editor__tabs { display: flex; align-items: stretch; justify-content: space-between; border-bottom: 1px solid var(--ta-bench-border); height: 42px; }
.ta-tab { display: flex; align-items: center; gap: var(--ta-s-2); padding: 0 var(--ta-s-4); font: 400 13px/1 var(--ta-font-mono); color: var(--ta-bench-text-3); border-right: 1px solid var(--ta-bench-border); background: transparent; border-top: none; border-bottom: none; border-left: none; cursor: pointer; }
.ta-tab.is-active { background: var(--ta-terminal-bg); color: var(--ta-bench-text); box-shadow: inset 0 2px 0 var(--ta-brand-seed), 0 1px 0 var(--ta-terminal-bg); }
.ta-editor__actions { display: flex; align-items: center; gap: 10px; padding: 0 var(--ta-s-3); flex: none; }
.ta-editor__savestate { font: 400 12px/1 var(--ta-font-sans); color: var(--ta-warn-bench); }
.ta-editor__savestate.is-clean { color: var(--ta-bench-text-3); }
.ta-editor__body { flex: 1; min-height: 0; background: var(--ta-terminal-bg); padding: 12px 0; overflow: auto; font: 400 var(--ta-type-terminal-size)/1.75 var(--ta-font-mono); }
.ta-editor__body textarea { width: 100%; min-width: 0; font: inherit; color: var(--ta-bench-text); background: transparent; border: none; outline: none; resize: none; white-space: pre; padding: 0 var(--ta-s-4); display: block; }
.ta-editor__row { display: flex; min-width: max-content; padding-right: var(--ta-s-4); color: var(--ta-bench-text); }
.ta-editor__num { width: 46px; flex: none; text-align: right; padding-right: 14px; color: #4E5A50; user-select: none; }
.ta-editor__row.is-active { background: #1B2620; }
.ta-editor__row.is-active .ta-editor__num { color: var(--ta-bench-text-2); }
.ta-editor__directive { color: var(--ta-brand-seed); }
.ta-editor__status { display: flex; align-items: center; justify-content: space-between; gap: var(--ta-s-3); border-top: 1px solid var(--ta-bench-border); background: var(--ta-bench-2); padding: 8px var(--ta-s-4); font: 500 12px/1 var(--ta-font-mono); color: var(--ta-bench-text-3); }

/* ---------- log / output viewer ---------- */
.ta-log { background: var(--ta-terminal-bg); border: 1px solid var(--ta-bench-border); border-radius: var(--ta-r-4); overflow: hidden; }
.ta-log__head { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 9px var(--ta-s-4); border-bottom: 1px solid var(--ta-bench-border); min-width: 0; }
.ta-log__title { font: 500 11.5px/1 var(--ta-font-mono); letter-spacing: 0.05em; color: var(--ta-bench-text-2); text-transform: uppercase; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.ta-log__body { padding: 12px var(--ta-s-4); font: 400 var(--ta-type-terminal-size)/1.65 var(--ta-font-mono); color: var(--ta-bench-text-2); }
.ta-log__body .is-error { color: var(--ta-terminal-error); overflow-wrap: break-word; }

/* ---------- modal / sheet ---------- */
.ta-modal { position: fixed; inset: 0; z-index: 70; display: flex; align-items: center; justify-content: center; padding: var(--ta-s-4); }
.ta-modal[hidden] { display: none; }
.ta-modal__backdrop { position: absolute; inset: 0; background: rgba(32, 40, 31, 0.4); }
.ta-modal__panel { position: relative; width: 100%; max-width: 520px; max-height: 100%; overflow-y: auto; background: var(--ta-paper-raised); border: 1px solid var(--ta-paper-border); border-radius: var(--ta-r-3); box-shadow: var(--ta-shadow-modal); padding: 28px; }
@media (max-width: 480px) { .ta-modal { padding: 0; align-items: stretch; } .ta-modal__panel { max-width: none; border-radius: 0; border: none; padding: var(--ta-s-4); } }
.ta-modal__head { display: flex; align-items: flex-start; justify-content: space-between; margin-bottom: var(--ta-s-4); }
.ta-modal__title { font: 600 21px/1.25 var(--ta-font-sans); margin: 0; }
.ta-iconbtn { display: inline-flex; align-items: center; justify-content: center; width: 44px; height: 44px; background: transparent; border: none; color: var(--ta-ink-2); cursor: pointer; flex: none; }

/* ---------- notices ---------- */
.ta-notice { display: flex; gap: 10px; align-items: flex-start; border-radius: var(--ta-r-2); padding: 13px 15px; font: 400 var(--ta-type-ui-small-size)/1.55 var(--ta-font-sans); border: 1px solid; }
.ta-notice .ta-icon { flex: none; width: 16px; height: 16px; margin-top: 2px; }
.ta-notice--info { border-color: var(--ta-info-border); background: var(--ta-info-tint); color: var(--ta-info-deep); }
.ta-notice--warn { border-color: var(--ta-warn-border); background: var(--ta-warn-tint); color: var(--ta-warn-deep); }
.ta-notice--fail { border-color: var(--ta-fail-border); background: var(--ta-fail-tint); color: var(--ta-fail-deep); }
.ta-notice--ok { border-color: var(--ta-ok-border); background: var(--ta-ok-tint); color: var(--ta-ok-deep); }

/* ---------- system states ---------- */
.ta-skeleton { border-radius: 4px; background: var(--ta-paper-recessed); animation: ta-shimmer 1.4s var(--ta-ease-out) infinite alternate; }
@keyframes ta-shimmer { from { opacity: 1; } to { opacity: 0.55; } }
@media (prefers-reduced-motion: reduce) { .ta-skeleton { animation: none; } }
.ta-empty { border: 1px solid var(--ta-paper-border); border-radius: var(--ta-r-3); background: var(--ta-paper-raised); padding: var(--ta-s-8); text-align: center; }
.ta-locked-block { border: 1px dashed var(--ta-locked-border); border-radius: var(--ta-r-3); padding: var(--ta-s-4); color: var(--ta-locked-text); }

/* ---------- learning shell layout ---------- */
.ta-shell { height: 100dvh; display: flex; flex-direction: column; overflow: hidden; }
.ta-shell__header { flex: none; display: flex; align-items: center; gap: var(--ta-s-4); background: var(--ta-paper-raised); border-bottom: 1px solid var(--ta-paper-border); padding: 0 var(--ta-s-4); min-height: 54px; }
.ta-shell__title { flex: 1; min-width: 0; font: 600 15.5px/1.2 var(--ta-font-sans); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ta-shell__body { flex: 1; display: flex; min-height: 0; }
.ta-shell__reader { display: flex; flex-direction: column; min-width: var(--ta-reader-min); overflow: hidden; flex: 0 0 52%; }
.ta-shell__readerscroll { flex: 1; overflow-y: auto; min-height: 0; }
.ta-shell__readerinner { max-width: var(--ta-reading-max); margin: 0 auto; padding: var(--ta-s-8) var(--ta-s-8) 72px; }
.ta-shell__divider { flex: 0 0 10px; cursor: col-resize; display: flex; align-items: center; justify-content: center; touch-action: none; background: transparent; border: none; padding: 0; }
.ta-shell__divider::after { content: ""; width: 2px; height: 36px; background: var(--ta-paper-border-strong); border-radius: 1px; }
.ta-shell__bench { flex: 1; min-width: var(--ta-bench-min); display: flex; flex-direction: column; overflow: hidden; padding: 12px 14px 14px 6px; }
.ta-objective { flex: none; display: flex; align-items: center; gap: var(--ta-s-3); background: var(--ta-paper-raised); border: 1px solid var(--ta-paper-border); border-radius: var(--ta-r-3); padding: var(--ta-s-3) var(--ta-s-4); margin-bottom: 10px; }
.ta-objective__text { flex: 1; min-width: 0; font: 500 var(--ta-type-ui-small-size)/1.45 var(--ta-font-sans); }
.ta-modetabs { display: none; }
@media (max-width: 1024px) {
  .ta-shell__meta { display: none; }
  .ta-shell__reader { min-width: 0; flex: 1; padding-bottom: 64px; }
  .ta-shell__bench { min-width: 0; padding: 10px 10px 76px; }
  .ta-shell__divider { display: none; }
  .ta-tree { display: none; }
  .ta-shell.is-read .ta-shell__bench { display: none; }
  .ta-shell.is-practice .ta-shell__reader { display: none; }
  .ta-modetabs { position: fixed; left: 0; right: 0; bottom: 0; z-index: 40; background: var(--ta-paper-raised); border-top: 1px solid var(--ta-paper-border-strong); display: flex; gap: var(--ta-s-2); padding: var(--ta-s-2) var(--ta-s-3) calc(var(--ta-s-2) + env(safe-area-inset-bottom)); }
  .ta-modetabs .ta-tabbtn { flex: 1; display: inline-flex; align-items: center; justify-content: center; gap: var(--ta-s-2); font: 500 var(--ta-type-ui-size)/1 var(--ta-font-sans); min-height: 46px; border-radius: var(--ta-r-2); border: 1px solid var(--ta-btn-secondary-border); background: transparent; color: var(--ta-ink); cursor: pointer; }
  .ta-modetabs .ta-tabbtn[aria-pressed="true"] { background: var(--ta-action); border-color: var(--ta-action); color: var(--ta-action-text); }
}

/* ---------- outline drawer ---------- */
.ta-drawer { position: fixed; inset: 0; z-index: 50; }
.ta-drawer[hidden] { display: none; }
.ta-drawer__panel { position: absolute; top: 0; bottom: 0; left: 0; width: 340px; max-width: 88vw; background: var(--ta-paper-raised); border-right: 1px solid var(--ta-paper-border); box-shadow: var(--ta-shadow-modal); display: flex; flex-direction: column; }
.ta-drawer__head { flex: none; display: flex; align-items: center; justify-content: space-between; padding: 10px var(--ta-s-2) 10px var(--ta-s-4); border-bottom: 1px solid var(--ta-paper-recessed); }
.ta-drawer__scroll { flex: 1; overflow-y: auto; padding: 6px var(--ta-s-3) var(--ta-s-4); }
.ta-drawer__section { font: 500 11.5px/1.3 var(--ta-font-mono); letter-spacing: 0.05em; color: var(--ta-ink-3); padding: 12px 6px 6px; text-transform: uppercase; }
.ta-lessonrow { display: flex; align-items: center; gap: 10px; width: 100%; min-height: 44px; padding: 6px var(--ta-s-2); border: none; border-radius: var(--ta-r-2); cursor: pointer; font: 400 var(--ta-type-ui-small-size)/1.35 var(--ta-font-sans); text-align: left; background: transparent; color: var(--ta-ink); }
.ta-lessonrow:hover { background: var(--ta-paper); }
.ta-lessonrow[aria-current="true"] { background: var(--ta-paper-recessed); box-shadow: inset 3px 0 0 var(--ta-action); font-weight: 500; }
.ta-lessonrow .ta-row__label { font: inherit; }
.ta-mark { width: 14px; height: 14px; border: 1.5px solid var(--ta-paper-border-strong); border-radius: 50%; flex: none; }
.ta-mark--done { border: none; background: var(--ta-ok-tint); box-shadow: inset 0 0 0 1.5px var(--ta-ok); }
.ta-mark--current { border-color: var(--ta-ink); background: radial-gradient(circle at center, var(--ta-ink) 0 3.5px, transparent 4px); }
.ta-mark--locked { border-style: dashed; }